Skia master-only scheduler: only trigger on Skia repo
Skia master-only scheduler: only trigger on Skia repo

BUG=skia:3518

Review URL: https://codereview.chromium.org/982173004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294388 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build